The aim of this paper is to summarize the attitude and practice of Japan with regard to the immunity of the property of foreign states. However, the number of cases of this kind in Japan is rather limited. Generally, the attitude or practice of a state can be determined by examining the practice of its legislature, judiciary and executive. In the case of Japan, however, there are no special laws or regulations concerning the question of execution against property owned by a foreign state. Furthermore, no official views have been stated by the executive on the immunity of a foreign state from Japanese jurisdiction. Therefore, the principal source of Japanese practice concerning state immunity is constituted by court decisions. It is possible to learn much about the position of the Japanese Government through analogies drawn from these cases, and from foreign cases in which Japan has been the defendant. Some treaty provisions concluded by Japan concerning the jurisdictional immunity of state property will also be mentioned.